Door contact-switch.



A. KIELBL'CK & H. DITTMANN. booR CONTACTv SWITCH. APPLIGATION FILEDJUNEYS, 1913.

Patented July 14,1914.

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ALBERT KIELBLOCK AND HERMANN DITTMANN, OF ARNSTADT, GERMANY.

noon CONTACT-SWITCH.

Specification of Letters Patent.

Application filed June 3, 1913. Serial No. 771,552.

To all whom it may Concern y Be it known that we, ALBEETKIELBL-ocir andHERMANN DITTMANN, subjects of the German Emperor, residing at Arnstadt,Principality of Schwarzburg-Sondershausen, Germany, have inventedcertain new and useful Improvements in Door Contactv Switches, of whichthe following is a specification.

This invention proposes an improved door contact switch which is soconstructed as to operate, in effect, as a time switch, the arrangementbeing such that on the door beingvopened, an electric circuit is closedand maintained closed for a certain time after the closing of the door,depending on the adjustment of the switch, until, .after the expirationof that time, the circuit is automatically opened by the switch.

According to this invention, an arm moved by the door and controlling byits motion the contact device, is placed under the action of a springand of a brake device, so that the forward movement of the arm producedby the opening of the door and bringing the contact device into theposition for closing the circuit, takes place in opposition tothe actionof the spring which brings about a return movement of the arm, retardedbythebrake device, the circuit remaining closed until the arm has againl reached its initial position.

A construction according to this invention is illustrated `by way ofexample in the accompanying drawing.

Figure 1 is a front elevation of the device,

. partly in section, Fig 2 a side elevation, Fig.

3 a plan ofthe device in the position of rest, Fig..4 a plancorresponding to Figf, with the switch in the position corresponding tothe open door, and Fig. 5 is a detail view.

To an insulated bed-plate 1 is secured an angle part 2 carrying avertical pivot pin 3. About the'said pin 3 is rotatably mounted a springcasing 4 containing a spring 5 secured on the one hand, to the fixedpin3, and on the other hand, to the casing 4. rlhe spring casing 4 isclosed at the bottom by plate 6 provided with four vertical studs 7,

made of-rubber or other yielding or resilient material. vThe lower facesof the said studs y7 rest against the fiat surface of a glass plate 8,which, in turn, rests upon the horizontall arm of the angle part 2, anintermediate plate 9` being inserted between said arm and the plate 8.Above the spring cas-- Patented July 14, 1914.

ing 4 is arranged a disk 10 which is suitably held against turning, andabove this disk are placed a nut 11, engaging with the pivot pin 3, anda lock nut 12. The nut 11 is used for regulating the pressure exercisedby the studs 7 on the plate 8 and the consequent y friction between thefront faces of the studs 7 and the surface of the plate S, while thelock nut 12 is used in known manner for securing the nut 11. The disk 10is provided at the upper surface with a scale division p 1021 showingthe adjustment. The spring casing 4 is encircled by the boss or hub 13of the lever 14, which can be secured to the `spring casing 4 by meansof asegment part 15 pivoted at 16 to the lever 14, and of a screw 17arranged on the segment 15. Then securing or locking the lever 14,thatend 15a of the segment which is situated opp osite the screw 17, ispressed against the outer edge of the spring casing 4, while on theother hand the screw 17 also engages with the surface of the springcasing 4. The lever 14 is provided at its front free end with adepending driver 19 carrying a terminal roller 18, the said driver beingpivoted to the lever 14 in such a manner that it can be swung to oneside, so that it can be turned within or out of reach of the door 20, inthe latter case into the dotted-line lposition shown in Fig. 1. The-hub18 'of the lever 14 Y is further provided with an upward flange 21 whichextends about half-wayaroun`d its peripheral edge and is concentric withthe pivot pin 3, the said flange 21 being adjustable on the hub 13 bymeans of the screw 22 and provided at its ends withbeveled portions21Pand 211). To the-plate 1 is also secured a bolt 25 sli'dablein theguide 23 and provided at its lower end with a roller 26 arranged forcoperation withthe flange 21. At its ripper end, the bolt 25 is providedwith a Contact piece 26fL secured to the bolt 25 by means of aninsulating piece 27, to which. latter is connected the upper end of aspring 24 that serves to normall 1 draw said rod downward. Above thecontact piece 26a, are arranged two spring; contacts 28, 29 which areconnected to the electric wires through the agency of the correspondingbearing posts 30, 31 which in their turn are l the bed plate 1.y

responding time.

that the time during which the circuit re- 18, 19, the lever 14 from theposition shown in Fig. 3, into that shown in Fig. 4. At the beginning ofthis movement, the cam face 21a engages under the roller 26 of the bolt25 and raises the latter, in opposition to the laction 0f the spring 24,whereby the electric circuit is closed, owing to the engagement of thecontacts 28, 29 by the contact piece 26. As during further movement ofthe lever 14, the roller 26 travels along the upper edge of the flange21, the circuit at first remains closed. Whenthe door 2O is againclosed, the tensioning of the spring effected during the opening of thedoor or during the movement forward of the switch lever 14, brings thelever 14 back to its original position. This return movement is howeverretarded by the braking action of the studs 7 on they plate 8, to agreater or less extent according to the adjustment by means of the nut11.l Since the circuit is maintained closed, as will bereadilyunderstood, until the lever 14 returns to its initial position and thebolt 25 has again assumed itsl initial position, (after each opening ofthe door) the lamps in the circuit closed by the above mentionedcont-act device will remain alight for a cori It has been already statedmains closed, can be adjusted at will the adjustment depending on thelocal conditions. If the door contact switch is, for instance, arranged0n a street door, itl is necessary to seek that the circuit remainsclosed for a time required to reach the fiat situated at the top of thebuilding, if for instance the'door contact switch switches in the lampsfor lighting the staircase. The door contact switch, chiefly intendedtherefore for closing a lamp circuit, may also be utilized to close abell or other circuit. It is however possible in a simple manner toclose simultaneously by the door contact switch several circuitsindependently of each other, for instance a circuit for producing anaudible signal and a lighting circuit. To effect this result the bolt 25is provided with a lateral finger or like projection 32, preferablyinsulated, which, in the initial position' of the bolt 25, is situatedunder two -superposed spring contacts 33, 34 used for closing the bellcircuit and also secured to If during an oscillation of the lever 14 inthe manner hereinbefore described, the bolt 25 is pushed upward, theprojection 32 raises the lower contact 33 `'against the upper contact34, whereby the electric signal circuit is closed and remains closeduntil the lever 14, after the closing of thel door 20, has again reachedits initial position.

In order to enable the door contact switch to be used for right-handedas well as for left-handed doors, its parts are-'made symmetrical, sothat they can be simply turned as required, and of course the spring 5in the spring casing 4 must also be turned accordingly.

What we claim as our invention and desire to secure by Letters Patent isz- 1. In a switch, the combination, with a vertically-movable switchmember; of a rotatable element upon which the switch member rests havinga cam arranged to engage and raise said switch member; an operatingmember connected to said element for rotating the same in one direction;a spring connected to said element for rotating the same iii the otherdirection; and a brake device -for retarding the second-named rotarymovement of said element.

2. In a switch, the combination with an endwise-movable vertical switchmember; of a rotatable element arranged beneath the switch member andprovided with a earn adapted to engage said switch member and havingoppositely-beveled ends and an intermediate straight portion; means forrotating said element in one direction; a spring connected to saidelement for rotating the saine in the other direction; and a brakedevice for retarding the second-named rotary movement of said element.

vertically-movable switchv member; of a r0- tatable element upon whichthe switch member rests having a cam arranged to operafor rotating saidelement in one direction; ai spring connected to said element for rotat--ing the same in the other direction; anda brake device for retardingthe second-named rotary movement of said element embodying a pluralityof yielding elements connected to said element for rotation therewith,and a stationary member frictiona'lly engaged by said yielding elements.

4. In a switch, the combination, with a vertically-movable switchmember; of a rotatable element upon which the switch member rests havinga cam arranged to operatively engage said switch member; means forrotating said element in one direction; a spring connected to saidelement for rotating the same in the other direction; and a brake devicefor retarding the Second-named rotary movement of said element embodyinga plurality of vertically-disposed rubber studs carried by said elementfor rotation therewith, and a stationary plate frictionally engaged bysaid studs.

5. In a switch, the combination, with an endwise-movable vertical switchmember; of a rotatable element arranged beneath the switch member andprovided with a cam adapted t0 engage said switch member and havingoppositely-beveled ends and an intermediate straight portion; means forrotating said element in one direction; a i spring connectedk to saidelement for rotat- 3. In a switch, the combination, with a tively engagesaid switch member; meansl ing the same in the other direction; and abrake device for retarding the second-named rotary movement of saidelement embodying a plurality of yielding elementsconnected to saidelement for rotation therewith, and a Stationary member rictionallyengaged by said yielding elements.

6. In a switch, the combination, with a vertically-movable switchmember; of a rotatable element upon which the switch mem* ber restshaving a cam arranged to operatively lengage said switch member; meansfor rotating said element in one direction; a spring connected to saidelement for rotating the same in the other direction; and a brake devicefor retarding the second-named rotary movement of said element embodyinga plurality of yielding elements connected to said element for rotationtherewith, a stationary member frictionally engaged by said yieldingelements, and means for regulating the pressure exerted by said yieldingelements upon said stationary member.

In testimony whereof we have hereunto set our hands in presence of twosubscribing witnesses.

ALBERT KIELBLOCK. HERMANN DITTMANN.

Witnesses ERNST EBERHARDT, Hnnwie HFFNER.

Copies yo1.' this patent may be obtained for ve cents each, byaddressing the Commissioner of Patenti,

Washington, D. C.

